Which of these were observed from earth prior to

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15.Which of these were observed from Earth, prior to spacecraft missions to Mars?
16.The deepest depression found on the surface of Mars is the
17.Valles Marineris is the most striking example of a(n)
18.The most striking valley in the solar system is:
19.The largest shield volcano yet discovered is:
20.Why is the southern hemisphere of Mars believed to be older than the northern?
21.Olympus Mons and Maxwell Mons are bothshield volcanoes.22.The NASA missions that landed on Mars in 1976 were theVikings I and II.23.What property of Mars is responsible for producing the great heights of its volcanos?
24.Which of the following characterizes a shield volcano?
25.Which of these is not now on the surface of Mars?
Mars Global Surveyor26.The first successful landers on the surface of Mars were:
27.The NASA lander which deployed the first rover, Sojourner, in 1997 was:
28.The largest difference between Mars' northern and southern hemispheres is that:
29.
30.What is thought to be the reason that there are no small impact craters on Mars?
31.The largest and deepest impact basin found on Mars is:
32.That the Tharsis region on Mars has so few craterssuggests it is the youngest region on the planet.33.The outflow channels on Mars indicate a flood period in the history of Mars. During this time,based on the width and depth of the remaining riverbed, it is thought that the flow rate musthave beenenormous, as much as 100 times the flow rate of the Amazon River.

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